The inverse Faraday effect is a magneto-optical process allowing the magnetization of matter by an optical excitation carrying a non-zero spin of light. This phenomenon was considered until now as symmetric; right or left circular polarizations generate magnetic fields oriented in the direction of light propagation or in the counter-propagating direction. Here, we demonstrate that by manipulating the spin density of light in a plasmonic nanostructure, we generate a chiral inverse Faraday effect, creating a strong magnetic field of 500 mT only for one helicity of the light, the opposite helicity producing this effect only for the mirror structure. This new optical concept opens the way to the generation of magnetic fields with unpolarized light, finding application in the ultrafast manipulation of magnetic domains and processes, such as spin precession, spin currents and waves, magnetic skyrmion or magnetic circular dichroism, with direct applications in data storage and data processing technologies.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11501613 | PMC |
| http://dx.doi.org/10.1515/nanoph-2022-0772 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Orbital magnetism through inverse Faraday effect in metal clusters.
Nanophotonics
November 2024
Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306, F-69100, Villeurbanne, France.
In view of the recent increased interest in light-induced manipulation of magnetism in nanometric length scales this work presents metal clusters as promising elementary units for generating all-optical ultrafast magnetization. We perform a theoretical study of the opto-magnetic properties of metal clusters through ab-initio real-time (RT) simulations in real-space using time-dependent density functional theory (TDDFT). Through ab-initio calculations of plasmon excitation with circularly polarized laser pulse in atomically precise clusters of simple and noble metals, we discuss the generation of orbital magnetic moments due to the transfer of angular momentum from light field through optical absorption at resonance energies.
View Article and Find Full Text PDFLarge property models: a new generative machine-learning formulation for molecules.
Faraday Discuss
September 2024
Department of Chemical and Biomolecular Engineering, The University of Notre Dame, Notre Dame, Indiana, USA.
Article Synopsis
- Generative models for designing molecules have not shown significant improvements over traditional expert intuition, particularly in predicting specific properties due to limited data availability.
- A major challenge is that there are often very few samples for desired properties, making it hard to accurately map properties to molecular structures.
- The authors propose that providing multiple properties during training can enhance the accuracy of generative models, leading to new models they call "large property models" (LPMs) which incorporate a wealth of available chemical property data to improve predictions.
Nonmagnetic media can be magnetized by light via processes referred to as an inverse Faraday effect (IFE). With nonmagnetic metal nanostructures, the IFE is dominated by the presence of light-induced solenoidal surface currents or plasmons with orbital angular momenta, whose properties depend on both the light and nanostructure geometry. Here, through a systematic study of gold nanodisks with different sizes, we demonstrate order-of-magnitude enhancement of the IFE compared to a bare gold film.
View Article and Find Full Text PDFSpatially inhomogeneous inverse Faraday effect provides tunable nonthermal excitation of exchange dominated spin waves.
Nanophotonics
February 2024
Russian Quantum Center, 143025, Skolkovo, Moscow Region, Russia.
We demonstrate optical nonthermal excitation of exchange dominated spin waves of different orders in a magnetophotonic crystal. The magnetophotonic structure consists of a thin magnetic film and a Bragg stack of nonmagnetic layers to provide a proper nonuniform interference pattern of the inverse Faraday effect induced by light in the magnetic layer. We found a phenomenon of the pronounced phase slippage of the inverse Faraday effect distribution when the pump wavelength is within the photonic band gap of the structure.
View Article and Find Full Text PDFCircularly polarized radiation to control the superconducting states: stability analysis.
J Phys Condens Matter
November 2024
University of Bordeaux, LOMA UMR-CNRS 5798, F-33405 Talence, France.
Recently, the use of circularly polarized radiation for on-demand switching between distinct quantum states in a superconducting nanoring exposed to half-quantum magnetic flux has been proposed. However, the effectiveness of this method depends on the system's stability against local variations in the superconducting characteristics of the ring and flux fluctuations. In this study, we utilize numerical simulations based on the time-dependent Ginzburg-Landau equation to evaluate the influence of these inevitable factors on the switching behavior.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!